Why am I getting a javascript NaN error message? -

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doing project intro javascript class , can't quite figure out why isn't working. can me out? here code assignment.

//declare variables var guestsperroom; var discount; var goodview; var totalcost; var costpernight; var membership;  //prompt user enter info based on needs guestsperroom = prompt("how many guests staying in room? (max 6)"); discount = prompt("are member of aaa?"); goodview = prompt("would room view? (10% price increase)");  //calculate guests needs total cost totalcost = number(totalcost); discount = number(discount); costpernight = number(costpernight);  //output users total cost if (guestsperroom === 1 || guestsperroom === 2) {   costpernight = 50;   if (membership === 'y') {     discount = costpernight * 0.85;   }   else if (membership === 'n') {     discount = costpernight;   }   if (goodview === 'y') {     totalcost = costpernight * discount * 1.1;‹   }   else if (goodview === 'n') {     totalcost = costpernight * discount;   } }  document.write("total cost per night $" + totalcost);

when run program, hoping phrase "total cost per night $50(or whatever total cost be). can tell me i'm doing wrong? guess totalcost variable not defined, cannot figure out.

the problem trying convert number non numeric answers these 2 questions:

discount = prompt("are member of aaa?"); goodview = prompt("would room view? (10% price increase)");  discount = number(discount); costpernight = number(costpernight);

of course answers not numbers. hence error.


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